Hot-water bag



Nm., 2%, igf. B. CHRISTENSON l 294339677 HOT WATER BAG Filed March 26, 1945 2 Sheets-Sheet l NGV. 26, 946. E, CHRISTENSON ALT HOT WATER BAG Filed March 26, 1945 2 Sheets-Sheet 2 i' /gellv fr? V575 ifi/Him!! Patented Nov. 26, 1946 UNITED STATES PATENT OFFICEv 3 Claims.

My invention relates to improvements in hot water bags, the primary object in view being to equip such a device for heating by electricity with electrical heating means incorporated in the bag and fully protected against contact with the water.

Another object is to equip such bags with electrical heating means interposed between the walls of the bag and completely closed oir from water in the bag.

Still another object is to provide a hot water bag equipped in the manner and for the purpose above set forth which is comparatively inexpensive to manufacture and not liable to get out of order.

Other and subordinate objects also comprehended by my invention, together with the precise nature of my improvements, will become readily apparent when the succeeding description and claims are read with reference to the drawings accompanying and forming part of this specification.

In said drawings;

Figure 1 is a View in side elevation, partly broken away and shown in section, of a hot water bag embodying my improvements;

Figure 2 is a view in edge elevation;

Figure 3 is a view in longitudinal section taken on the line 3 3 oi Figure l;

Figure 4 is a view in transverse section o the core;

Figure 5 is a fragmentary view in longitudinal section taken on the line 5-5 of Figure 2 and drawn to an enlarged scale.

Describing my invention in detail, with reference to the drawings by numerals, I designates the hot water bag, proper, which is formed of the usual material, such as rubber or rubber composition, and comprises sides E secured together at the edges that is, the longitudinal edges, by seams, as at d, for instance by vulcanization.

A filler neck 5 of suitable material, and preferably rectangular in cross-section, is inserted into the top of the bag I centrally oi said top, and which tapers inwardly of the bag i and is provided with a lateral intermediate flange 6 for clamping to the top oi the bag I on the inside thereof, and with a clamping collar 'I tting around said neck against the outside of said top and soldered or otherwise secured to said neck, as at 'l'.

A stopper 8, preferably oi rubber, is provided for fitting into said neck 5 with a wedging action. A locking pin 9 extends through said stopper 8, centrally, with an outer end, hand grip-forming head I5, lateral intermediate lugs II thereon for engaging the outer end of the stopper 8,.and a threaded inner end I2 adapted to be turned into a threaded opening I3 formed in a bridge piece I4 traversing the inner end of said neck 5. As the pin 9 is turned into said opening I3, the lugs II compress the stopper 8 in the neck 5 to tightly close said neck.

Within the bag i is a slab-like core if: of rectangular form, and which is shorter than the bag i to space the same from the bottom of said bag and from the neck 5, but is of a width to iit between the edges 3 of said bag. The core I4 is preferably formed of rubber or rubber composition and is attached at its side edges I5 along the seams l preferably by vulcanization. The sides of the core ifi between said edges thereof are detached from the sides of the bag I so that said bag may be distended by pressure of water therein. Transverse through ports I5, preferably cylindrical, are provided in the core I4 in longitudinal rows, with the ports I6 in alternate rows staggered relative to those in intermediate rows, said ports providing for passage of water through the core from side to side of the bag I. The sides of the core I4 are corrugated by longitudinal grooves I'I arranged intermediate rows of ports I6, the grooves il on each side being opposite those on the other side of said core. The grooves II reduce the thickness of the core Ill between opposite grooves for a purpose presently seen. An elongated tapered tongue IB, forming an integral part of the core I 4, extends from the top edge of said core through the top of the bag at one side of the neck 5, and which is suitably attached to the top of the bag, as by vulcanization, to form a Water-tight seal between the same and said bag.

Heating elements in the form of looped coils i9, 25 are embedded in the core I4 in a common plane therewith to extend between the rows of ports I5 and along the top and bottom edges of said core, the coils I9, 20 being reversed in one element relative to those in the other element and the coils 2E) of one element extending into the coils i9 oi the other element, the terminals 2I of the coil I9 and those 22 of the coil 2i) extending into the tongue I8, and being connected by a suitable coupling 23 to an electric cable 24, of any suitable type, extending out of said tongue I8 and provided with a suitable switch 25 therein such as is commonly used in regulating the degree of heat generated by electrical heating devices. As shown in Figure 1, the coils I9, 20 are arranged to extend around the ends of alternate rows of ports I6, respectively.

The manner in which the described invention operates will be readily understood. The described heating coils, or loops, I9, 20 heat the core I4 which heats the water in the bag l, and said core provides heat-transfer surfaces of maximum area, whereby the water is quickly heated to a high temperature. The core I4 being flexible does not interfere with using the bag in the usual manner, and the ports I6 and grooves I1 render the core light in weight, yet strong, and reduce the amount of space lled by said core.

The foregoing will, it is believed, sufiice to impart a clear understanding of my invention without further explanation.

Manifestly, the invention, as described, is susceptible of modiiication without departing from the inventive concept, and right is herein reserved to such modifications as fall within the scope of the appended claims.

What I claim is:

1. A hot water bag having longitudinal edges and sides, a slab-like rectangular core of flexible insulating material having longitudinal edges f1tting in the bag between the edges thereof, said edges of the core being connected to said edges of the bag, the sides of the bag being free from connection with said core, a tongue extending from the top edge or" said core out of the top of said bag, electrical resistance coils embedded in said core in substantially the plane thereof and having terminal ends extended into said tongue, and an electric cable extending from said tongue and to which said terminals are connected, said core having transverse ports therein for the passage of water through said core, and arranged in rows with the ports in alternate rows staggered relative to the ports in intermediate rows to provide for a maximum number of ports in said core.

2. A hot water bag having longitudinal edges and sides, a slab-like rectangular core of flexible insulating material having longitudinal edges tting in the bag between the edges thereof, said edges of the core being connected to said edges of the bag, the sides of the bag being free from connection with said core, a tongue extending from the top edge of said core out of the top of said bag, electrical resistance coils embedded in said core in substantially the plane thereof and having terminal ends extended into said tongue, and an electric cable extending from said tongue and to which said terminals are connected, said core having transverse ports therein for the passage of water through said core and arranged in rows with the ports in alternate rows staggered relative to the ports in intermediate rows to provide for a maximum number of ports in said core, said coils extending between rows of ports and around the ends of alternate rows, respectively, to prevent water from contacting the same.

3. A hot water bag having longitudinal edges and sides, a slab-like rectangular core of exible insulating material having longitudinal edges tting in the bag between the edges thereof, said edges of the core being connected to said edges of the bag, the sides of the bag being free from connection with said core, a tongue extending from the top edge of said core out of the top of said bag, electrical resistance coils embedded in said core in substantially the plane thereof and having terminal ends extended into said tongue, and an electric cable extending from said tongue and to which said terminals are connected, said core having transverse ports therein for the passage of water through said core, and arranged in rows with the ports in alternate rows staggered relative to the ports in intermediate rows to provide for a maximum number of ports in said core, said coils extending between rows of ports and around the ends of alternate rows, respectively, to prevent water from contacting the same, said core being provided with longitudinal side grooves to reduce the thickness thereof between the grooves and facilitate transfer of heat through the core.

BEN CHRISTENSON. 

